abdullahtarawneh.com/static/scripts/mobileViewportHeight.js

var root = document.documentElement;
let vh = window.innerHeight * 0.01;
root.style.setProperty('--vh', `${vh}px`);
this.lastHeight = window.innerHeight;

/*
// We listen to the resize event
window.addEventListener('resize', () => {
  // We execute the same script as before
  if (
    window.innerWidth > window.innerHeight ||
    Math.abs(this.lastHeight - window.innerHeight) > 100
  ) {
      let vh = window.innerHeight * 0.01;
      root.style.setProperty('--vh', `${vh}px`);
      this.lastHeight = window.innerHeight;
  }
});
*/